( string dirname [, resource context] )
Attempts to remove the directory named by dirname.
The directory must be empty, and the relevant permissions must permit this.
Returns TRUE on success or FALSE on failure.
As of PHP 5.0.0 rmdir() can also be
used with some URL wrappers. Refer to Appendix M
for a listing of which wrappers support rmdir().
Note: When safe mode is enabled, PHP checks whether
the directory in which you are about to operate has the same UID (owner) as the
script that is being executed.
See also mkdir() and unlink().